[PATCH v2] docs: Clarify the documentation of the <css> elements

[Thomas Huth]

The channel subsystem elements describe a channel in the I/O subsystem
of a s390x machine, and not a normal device (like a disk or network card).
Reword the documentation here to make it this a little bit clearer.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1898074
Reviewed-by: Boris Fiuczynski <fiuczy at linux.ibm.com> 
Signed-off-by: Thomas Huth <thuth at redhat.com>
---
 v2: "channel" -> "subchannel" as suggested by Cornelia

 docs/formatnode.html.in | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/docs/formatnode.html.in b/docs/formatnode.html.in
index 1010a37a3d..5c7286df8a 100644
--- a/docs/formatnode.html.in
+++ b/docs/formatnode.html.in
@@ -396,15 +396,15 @@
             </dl>
           </dd>
           <dt><code>css</code></dt>
-          <dd>Describes a Channel SubSystem (CSS) device commonly found on
-          the S390 architecture. Sub-elements include:
+          <dd>Describes a subchannel in the Channel SubSystem (CSS) commonly
+          found on the S390 architecture. Sub-elements include:
             <dl>
               <dt><code>cssid</code></dt>
               <dd>The channel subsystem identifier.</dd>
               <dt><code>ssid</code></dt>
               <dd>The subchannel-set identifier.</dd>
               <dt><code>devno</code></dt>
-              <dd>The device number.</dd>
+              <dd>The subchannel number.</dd>
               <dt><code>capability</code></dt>
               <dd>
                 This optional element can occur multiple times. If it
-- 
2.27.0